Disinfectant.



- hydes, particularly formaldehyde, with ox- I time.

Having thus described my invention, I

UNITED siiurrrns PATENT OFFICE.

HANS SCHNEIDER, O1? WILMERSDORF, NEAR BERLIN, GERMANY.

DISINFECTANT.

No Drawing.

T 0 all whom it may concern."

Specific'ation of Letters Patent.

Application filed February 15, 1907. Serial No 357,552.

Patented Sept. 21, 1909.

also valuable for ordinary medicinal pur- Be it known that I; HANS SCIINEIDER,(1OC- 1 poses, as for example, for the disinfection tor of philosophy, chemist, a subject of the ployed in a very dil to form, owing to its German Emperor, and a resident of Vilmersdorf, near Berlin, Germany, have in vented i i cw and useful Improvements in Disinfectants, of which the following is a specification.

My invention relates to disinfectants which on account of their great capacity for killing bacteria excel all the commonly used disin e of the hands because its" solution can be emgreat capacity for in ling bacteria, so that the injurious caustic eflects upon. the hands bacilli, for example, are ki stantancously by a solution 0 this product.

ctants except corrosive sublimate, and

whose effectiveness is nearly as great as that of the latter salt.

I have discovered that by mixing phenol or phenol derivatives or germicidal aldealic acid in the manner hereinafter described, a great increase of the disinfecting power takes place.

fecting ower is much greater in case of oxalic aci than any other acid known to me, although sulfuric acid,,boric acid, and various organic acids have sometimes been used with phenols. This I application, however is restricted to the mixture of oxalic'acid In carrying out my invention, I take ordinary crystallized oxalic acid and heat it until the water of crystallization is wholly or partially expelled, forming a dry owder.

o 100 parts of this powder, I add 5 parts of 40 per cent. aqueous formaldehyde solution, and stir the mixture vigorously, the result being a dry homogeneous powder, which may be easily compressed into tablets and which is easily soluble in water.

This disinfectant. may be marketed either in the form of a concentrated solution, or in the, form of tablets.

The resulting product a highly efficient disinfectant, which is articularly suitable for the pur ose of disinfection on a large scale and or veterinary purposes. It is 1 with aldehydes and the process of making it. I

oxalic acid combined with a solution of for- Byactual experiment, I 7 have discovered that/this increase in disin- 1 are practically done away with. Very highly resisting staphylococptg and liliyphoid j d a 0st infrom one fourth to one-Hal per cent. in strength. This product is also .hi hly efiicient in the case of germs fqrm "g acteria, for example the highly nesistan *germs of anthrax will be killed by a four per cent. solution of this product in one two hours. Stronger solutions act in a "uch shorter claim 1. The method of making a disinfectant, consisting in heating oxalic acid, thereby driving off its water of crystallization, and mixing the dry powder thus produced with twenty-five per cent. of a forty per cent. aqueous solution of formaldehyde, substantially as described.

A disinfectant consisting of anhydrous February 1907.

HANS SCHNEIDER. Witnesses:

\VoLonMAR HAUPT, I'IENRY I'IASPER. 

